Despite the roar from the municipal water and wastewater industry about the lack of funds for infrastructure, Water & Wastewater News’ roundtable participants seemed to agree that the money is “out there,” it is just a matter of finding the right source.
- By Water & Wastewater News Staff
This article originally appeared in the 06/01/2007 issue of Environmental Protection.
A new generation of biological water treatment recycle systems
The WHO addresses quality and environmental aspects in new guidance document
- By Joseph A. Cotruvo, Ph.D., Houssain Abouzaid, Ph.D.
This article originally appeared in the 03/01/2007 issue of Environmental Protection.
California's population is expected to increase more than 30 percent over the next 23 years. Even with aggressive reuse and conservation, that many more people will require more than 1 billion gallons of drinking water.
This article originally appeared in the 01/01/2007 issue of Environmental Protection.
This article originally appeared in the 01/01/2007 issue of Environmental Protection.
Communities expect safe drinking water and clean water to do business. Water treatment plants are designed to provide that commodity but unforeseen situations often arise.
This article originally appeared in the 11/01/2006 issue of Environmental Protection.
Each and every one of us contribute to water pollution. "Not I," you say? Well, if you use personal care products, such as shampoos, lotions, or antiperspirants, you do. If you take any kind of medication, over-the-counter or prescription, you do.
This article originally appeared in the 09/01/2006 issue of Environmental Protection.
This article originally appeared in the 09/01/2006 issue of Environmental Protection.
Management at drinking water treatment facilities looking for an alternative to gaseous chlorine (Cl2) or sodium hypochlorite (NaOCl) should seriously consider dry chlorine in the form of calcium hypochlorite briquettes. Drinking water treatment facilities switching from sodium hypochlorite to calcium hypochlorite for disinfection are finding this alternative to be an efficient solution for ensuring consistently accurate chlorination while eliminating many long-standing operations, maintenance, and safety concerns associated with NaOCl use.
This article originally appeared in the 07/01/2006 issue of Environmental Protection.
On Jan. 23, 2006, the arsenic rule was implemented with a new limit of 10 parts per billion (ppb) (the old standard was 50 ppb). The new rule has a broad reach; it affects large and small drinking water treatment systems, including non-community water supplies.
This article originally appeared in the 06/01/2006 issue of Environmental Protection.
Groundwater and soil contamination are among the most time-consuming and costly environmental remediation challenges facing our communities today. Solvents, metals, organic compounds, and other chemicals remain in the soil and seep into groundwater long after the facilities that used or created the contaminants have stopped operating.
This article originally appeared in the 01/01/2006 issue of Environmental Protection.
Arsenic (As) removal from drinking water by adsorptive media has been a proven technology for years. In the western and southwestern United States, however, much of the As-tainted groundwater has a pH value that is high enough to significantly reduce the operating capacity of adsorptive media, including the iron-, alumina-, and titanium-based media commercially available to municipalities.
This article originally appeared in the 01/01/2006 issue of Environmental Protection.
Over the past few decades there has been an increased awareness of the importance of water quality. Many municipalities and industrial facilities have upgraded or installed new technologies to meet the demand for clean water. Advances in water quality science show that further improvements are needed to ensure a plentiful water supply and to protect the natural environment.
- By W. Wesley Eckenfelder, William Ney Hansard
This article originally appeared in the 10/01/2005 issue of Environmental Protection.
Too much chlorine. That's what the residents of two Tennessee cities said about their drinking water following a recent upgrade to their water treatment plant (WTP). As part of the upgrade, granular filter media from the conventional plant were removed and immersed, hollow-fiber ultrafiltration (UF) membranes were added to the plants treatment processes.
This article originally appeared in the 05/01/2005 issue of Environmental Protection.
Since the late 1990s membrane bioreactor (MBR) technology has rapidly entered the wastewater treatment market. The technology is a simple combination of an activated sludge process and a membrane filtration step. The separation of activated sludge and effluent is achieved by using porous membranes that are able to remove all the suspended solids from the biologically cleaned water.
This article originally appeared in the 03/01/2005 issue of Environmental Protection.
The full cost of ownership related to operating a water or wastewater treatment facility consists of the initial capital, commissioning, training, spare parts, maintenance, and calibration costs for the lifetime of the equipment.
This article originally appeared in the 09/01/2004 issue of Environmental Protection.
Creosote and other non-aqueous phase liquids (NAPLs) are responsible for high pump-and-treat costs in groundwater remediation because, due to their molecular size, they tend to clog activated-carbon pores quickly. The result is frequent change outs, which renders the pump-and-treat method too expensive.
This article originally appeared in the 07/01/2004 issue of Environmental Protection.
Access to safe drinking water and contamination of surface water bodies is a major problem in many areas of the globe. In the year 2000, approximately 1.1 billion people (18 percent of the world's population) lacked access to safe drinking water, and 2.4 billion (40 percent of the total population) lacked adequate sanitation.
This article originally appeared in the 07/01/2004 issue of Environmental Protection.